#| BEGIN (Введите свое решение) |#
(define (average x y)
  (/ (+ x y) 2))

(define (improve guess x)
  (average guess (/ x guess)))

(define (good-enough? guess x)
  (define improved (improve guess x))
  (> (/ (min guess improved)
        (max guess improved)) 0.9999999999))

(define (iter-root guess x)
  (if (good-enough? guess x)
      guess
      (iter-root (improve guess x)
                 x)))

(define (square-root x)
  (iter-root 1.0 x))
#| END |#